Che Fournal of Geology 
Published on or about the following dates: February 1, March 15, May 1, June 15, 
August 1, September 15, November 1, December 15. 
Vol. XX CONTENTS FOR APRIL-MAY, 1912 Ifo. 3 
AUSTRALIAN GLACIATIONS - - - - - - - - - - - - - - WALTER HowcHIN 193 
THE VALUE OF CERTAIN CRITERIA FOR THE DETERMINATION OF THE ORIGIN OF FOLIATED 
CRYSTALLINE ROCKS. I - - - - - - - - - - - - - J. D. TRUEMAN 228 
SILICEOUS OOLITES AND OTHER CONCRETIONARY STRUCTURES IN THE VICINITY OF STATE 
COLLEGE, PENNSYLVANIA - - - = - - - - - - - - Etwoop S. MoorE 2509 
PETROLOGICAL ABSTRACTS AND REVIEWS) - - - - + - Spi ee - af PA 8 ero 
REVIEWS -~ - SiS aie - - - - - - - - - - - - = - - - - - 281 
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